package com.example.gateway.filter;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * 检查请求是否来自以进登录的用户
 *
 * @author Liaorun
 */
@Order(-1)
//@Component
public class AuthorizeFilter implements GlobalFilter {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1.获取请求参数
        ServerHttpRequest request = exchange.getRequest();

        MultiValueMap<String, String> pa = request.getQueryParams();
        // 2 获取参数中的 Authorization 参数
        String authorization = pa.getFirst("Authorization");

        // 3. 判断参数值是否等于admin
        if ("admin".equals(authorization)) {
            // 4. 是，放行
            return chain.filter(exchange);
        }

        // 返回提示未登录，应该是权限不足
        exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);

        // 5.否，拒绝访问
        return exchange.getResponse().setComplete();
    }
}
